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公开(公告)号：US2884887A
公开(公告)日：1959-05-05
申请号：US36474253
申请日：1953-06-29
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： GRAY JOHN A , BEE ERNEST K
IPC: H01J5/40
CPC classification number: H01J5/40 , H01J2893/0035
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